<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demoScope</title>
</head>
<body>


<script>
    function a() {
        function b() {
            var bbb = 234;
            console.log(aaa);
        }
        var a = 123;
        return b;
    }
    var glob = 100;
    var demo = a();
    demo();
</script>
</body>
</html>
